Can't install XPI in Mozilla v1.3 in OS X?

Ant <[email protected]>
Newsgroups gmane.comp.mozilla.devel.macosx,gmane.comp.mozilla.devel.mac,gmane.comp.mozilla.devel.xpinstall
Organization PowerAntFarmX
Message-ID <[email protected]>
Hi.

I cannot seem to install Prefbar's XPI file from 
http://www.xulplanet.com/downloads/prefbar/ after upgrading Mozilla to 
v1.3 from v1.2.1. It worked in v1.2.1 recently. I get no errors or any 
pop-up (asking me to install or not). I tried installing locally, and it 
failed as well.

Is this a new bug in v1.3 for OS X? I got v1.3 from ftp.mozilla.org 
earlier today. Thank you in advance. :)
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